sudo systemctl status firewalld
sudo firewall-cmd --permanent --add-rich-rule="rule family='ipv4' source address='223.114.128.163' reject"
sudo firewall-cmd --reload
sudo firewall-cmd --list-all




sudo systemctl status ufw
sudo ufw deny from xxx.xxx.xxx.xxx to any
sudo ufw status



sudo iptables -I INPUT -s xxx.xxx.xxx.xxx -j DROP
sudo service iptables save
sudo iptables -L